Melles Griot 25-LHP-991-249 Red HeNe Laser 632.8nm 10mW Class 3B Tube

Melles Griot 25-LHP-991-249 Red HeNe Laser 632.8nm 10mW Class 3B Tube

The Melles Griot 25-LHP-991-249 is a continuous-wave (CW) red Helium Neon gas laser tube delivering 10.0 mW of output power at the standard HeNe wavelength of 632.8 nm. It is a self-contained cylindrical laser head with an attached power cable and 2-pin connector, ready for integration into an optical setup or instrument. Manufactured in November 2006, this unit carries CE marking and is rated as a Class 3B laser product compliant with DHHS/CDRH 21 CFR Sub-Chapter J and IEC 825-1:1993.

Specifications & What's Included

• Model: 25-LHP-991-249
• Laser Type: Helium Neon (HeNe) Gas Laser
• Laser Class: Class 3B
• Output Wavelength: 632.8 nm (red)
• Output Power: 10.0 mW
• Mode: CW (Continuous Wave)
• Beam Diameter: 0.65 mm
• Laser Head Length: 483.9 mm (19.05 in)
• Laser Head Diameter: 44.5 mm (1.75 in)
• Manufacture Date: November 2006
• Standards: DHHS/CDRH 21 CFR Sub-Chapter J; IEC 825-1:1993; CE marked
• Included: Laser head with attached power cable and 2-pin connector

Applications

Helium Neon lasers at 632.8 nm are among the most widely used gas lasers in scientific and industrial settings. Their highly coherent, single-mode red output makes them a standard light source for optical alignment, interferometry, holography, laser scanning, barcode readers, and educational demonstrations. The 25-LHP series from Melles Griot — part of their well-regarded catalog of HeNe laser heads produced through the 1990s and 2000s — was commonly used in research labs, metrology instruments, flow cytometers, and optical bench setups where a stable, narrow-linewidth visible beam is required. At 10 mW, this unit falls within the higher end of standard HeNe output levels, making it suitable for applications that need a bright, well-defined beam over longer working distances. HeNe lasers of this type remain in active use today in legacy instruments, academic labs, and anywhere a low-noise CW red source is preferred over diode alternatives.